Hello, I am trying to figure out what is happening with my step mother. Her entire life she has eaten wheat, dairy, soy, and gluten. Within the past two years she has suddently started getting really sick when eating any of the above. She keels over for days on end vomitting with diarrhea (more so with the gluten and soy). Is it possible to develop allergies at age 40, and that severe. Or could it potentially be something else?